Experiment 20 - pH Titration-Phosphoric Acid in Cola Drinks - Experiment 20 pH Titration Phosphoric Acid in Cola Drinks Christi Koutrelakos Lab Partners

Experiment 20 - pH Titration-Phosphoric Acid in Cola Drinks...

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Experiment 20 – pH Titration: Phosphoric Acid in Cola Drinks Christi Koutrelakos Lab Partners: Anna Krikorian, Griffin Jones, Madeline O’Connel 3/3/14 Chem 1212K – Section L06 Honor Pledge: “I did not share any part of this lab report after lab was finished.“
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II. Data & Results A. Standardization of NaOH Table 1. Volumes delivered and concentrations of “0.01 M NaOH Mass KHP (g) Volume “0.01 M” NaOH delivered Calculated [NaOH] 0.062 34.7 0.009 0.064 32.8 0.0095 0.062 32.8 0.009 0.066 26 0.012 0.066 42.1 0.008 Average 0.0095 Standard Deviation 0.0015 B. Titration of Cola Sample Trial 2. Initial parameters of titration Volume of cola (ml) Initial pH of cola 20 2.49 Table 3. Data for titration of cola sample Volume of titrant (m) pH Change in pH (calculated) Change in volume (ml) (calculated) Δph/ΔV (ml -1 ) (calculated) Average volume between points (calculated) 48.72 10.08 7.59 48.72 0.156 0.716
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Plot 1. Full page plot of titration curve and first derivative of the titration curve Table 4. Ka data Volume used to determine Ka (ml) (graphically) pKa Ka Literature Value, pKa Literature Value, Ka Ka calculated from initial pH 1 st Equilibrium Constant 13.35 4.8 1.6 x 10 -5 2.35 7.5 x 10 -3 3 x 10 -3 2 nd Equilibrium Constant 35.31 9.03 9.3 x 10 -10 7.21 6.2 x 10 -8 --------------
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Sample Calculations Standardized molarity of “0.01 M” NaOH solution, trial 1: 0.062 g KHP x 1 mol KHP 204.2 g KHP x 1 molNaOH 1 mol KHP = 3.07E-4 mol NaOH 3.07E-4 mol NaOH 0.0347 L = 0.009 M =
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  • Fall '12
  • SOPER
  • pH, Sodium hydroxide, Phosphoric acid, Cola Drinks

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